After having had to foot for a month and a half almost permanently, I understand where their success. They are ultra comfortable, very light and delightful. Also the straps are well back, which I think helps provide the support when you leave the beaten path a bit. Although it is not necessarily recommended, I even used it to go hiking in height difference in the rockery.
As against the soles are very flexible, it has still suffered a bit, but if one household, I think life is correct.
For size, for I take thongs generally one size bigger. In this case, I recommend taking the same size but in FR BR, for example if one makes 41-42 EN take 41-42 BR, and it should be perfect.